issueRef parameter in CashIssueFlow

Question

What's the main purpose of this "issueRef" parameter? And why the samples just put

OpaqueBytes.of("1".getBytes()

or

OpaqueBytes.of(0x01)

Is it just to link an issued asset to an issuer? Could one give me a usage example?

Answer 1

It's a reference to allow Corda users to link the on-ledger assets they hold to real-world assets.